NULL结果我有以下查询:如何去除串联
SELECT concat(first_name, ' ', last_name) as full_name FROM auth_user
我会怎么做等价的:
SELECT concat(first_name, ' ', last_name) as full_name FROM auth_user
**WHERE full_name IS NOT NULL**
(其产生的Unknown column 'full_name' in 'where clause'
)
因此,您只想跳过“first_name”和“last_name”为“NULL”的记录或要么? –